Question about paging file

By Rifero
Apr 14, 2011
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  1. Hello,

    I have Windows Vista Home Basic with 3GB physical memory.
    I am running a server on Oracle VM VirtualBox.
    It's not really clear to me how I can use paging file to increase the memory and performance of my server.
    My system often starts to run very slow or even stop responding for a minute.
    What I want, is to increase the memory on my server on VirtualBox.

    Thanks in advance =)
  2. hellokitty[hk]

    hellokitty[hk] Hello, nice to meet you! Posts: 3,448   +145

    Paging file allocates a piece of your harddrive and pretends it's RAM.
    It's not good at that, so it's much slower.
  3. Rifero

    Rifero TS Rookie Topic Starter Posts: 26

    I know, but I want my VirtualBox server to use my harddrive space as memory, how?
  4. jobeard

    jobeard TS Ambassador Posts: 11,173   +989

    Actually, there is REAL memory (ie RAM) managed by the OS,
    and Virtual Memory (that which the programs see). Typically, the Virtual Memory
    is 2-3x the Real installed Ram. When the active program needs real memory,
    it is stolen from another program, written into the pagefile, and the running program
    take control of that memory page. This is called paging-out. When the original program gets control again,
    that stolen page is fetched from the pagefile and the prgram continues without any side-effects.
    This link will show the mapping of virtual to real memory.

    Server systems typically need large real memory as they run far more processes to handle the work load (ie hit rates or database accesses).
    To use more than 3GB real, the server needs to have a 64bit OS.

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